The California Public Utilities Commission recently lowered the temperature threshold to 90 degrees for pausing power shutoffs for customers with unpaid bills. This decision overrides utility proposals and requires customized, region-specific heat standards to be implemented within six months .

Why the 90-Degree Threshold Trumps the Utility Proposal

The California Public Utilities Commission (CPUC) recently voted to reject a proposal from the state's major utilities that sought a uniform statewide shutoff threshold of 100 degrees Fahrenheit. Instead, the commission mandated a lower 90-degree trigger, ensuring that power remains on for delinquent customers during a broader range of dangerous weather events... According to the report, this move ensures that basic safety protections are extended to more residents before temperatures reach lethal levels.

Major utility providers, including PG&E, Southern California Edison (SCE), and San Diego Gas & Electric (SDG&E), had argued that a 90-degree limit was "overbroad." In a January filing, a PG&E spokesperson claimed that such a low threshold would lead to a surge in unpaid balances and increase costs without providing a proportional health benefit. However, the CPUC determined that the utilities' proposed path offered no meaningful improvement over prior practices.

From San Francisco's 85 Degrees to Del Norte's 76.8

A central point of contention in this ruling is the vast difference in heat tolerance across California's diverse geography. The CPUC resolution highlighted that extreme heat thresholds are already below 100 degrees in 41 of the state's 58 counties. While a 90-degree day is common in inland cities like Fresno or Bakersfield, such temperatures can be deadly in coastal or mountainous regions where residents are less acclimated and homes lack air conditioning.

To illustrate this disparity, the commission noted that San Francisco defines extreme heat as anything above 85 degrees. Even more starkly , in Del Norte County in the far northwestern corner of the state, the threshold for extreme heat is just 76.8 degrees. By rejecting a one-size-fits-all 100-degree rule, the CPUC is acknowledging that biological and infrastructural vulnerability is regional, not universal.

Using CalHeatScore to Map ZIP Code Vulnerability

The push for more granular protections was led by environmental justice advocates and consumer groups, including the Utility Reform Network and the National Consumer Law Center. these groups pointed to the CalHeatScore tool, a state-developed system that assigns a heat vulnerability score from Level 0 to 4 based on ZIP codes. This tool integrates local health data, the availability of cooling centers, and the density of high-risk populations, such as seniors and children.

The integration of CalHeatScore represents a shift toward data-driven equity in utility regulation. By using ZIP-code-level data,the state can identify exactly where a 90-degree day poses a higher risk of mortality than it would in a more resilient urban center. This approach moves the conversation from simple meteorology to public health infrastructure.

The Six-Month Deadline and the Data Gap

Despite the ruling, significant operational questions remain regarding the six-month deadline for implementing region-specific standards. As reported, utilities previously claimed they could not meet strict deadlines because the data system run by the Office of Environmental Health Hazard Assessment was not yet ready to support their needs. It remains unclear if the state's technical infrastructure has since been upgraded to allow PG&E, SCE, and SDG&E to automate these regional protections.

Furthermore, the source does not specify how the CPUC will monitor compliance or what penalties will be imposed if utilities fail to meet the six-month window. While the utilities have now stated they will comply, the tension between the Office of Environmental Health Hazard Assessment's data readiness and the utilities' operational capacity remains a critical friction point.

Evictions and Child Custody: The Human Cost of Disconnection

The fight over these thresholds extends beyond physical health to social stability. Jason Zeller, an attorney with the Utility Consumers' Action Network, explained that losing electricity often triggers a "cascading effect" of crises for tenants. According to the report, the loss of power can lead to evition proceedings or, in severe cases, the loss of child custody if a home is deemed uninhabitable.

It is important to clarify that these new protections apply strictly to shutoffs for unpaid bills. They do not prevent power outages resulting from equipment failure, emergencies, or the "Public Safety Power Shutoffs" (PSPS) used to prevent wildfires. Nevertheless, for the state's most financially precarious residents, the difference between a 90-degree and 100-degree threshold can be the dfiference between maintaining a home and facing homelessness.